20123112321 has 48 divisors (see below), whose sum is σ = 32786208000. Its totient is φ = 11800584576.

The previous prime is 20123112311. The next prime is 20123112323. The reversal of 20123112321 is 12321132102.

20123112321 is a `hidden beast` number, since 20 + 12 + 311 + 2 + 321 = 666.

It is not a de Polignac number, because 20123112321 - 2¹⁸ = 20122850177 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20123112294 and 20123112303.

It is not an unprimeable number, because it can be changed into a prime (20123112323) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 709980 + ... + 737778.

It is an arithmetic number, because the mean of its divisors is an integer number (683046000).

Almost surely, 2^20123112321 is an apocalyptic number.

It is an amenable number.

20123112321 is a deficient number, since it is larger than the sum of its proper divisors (12663095679).

20123112321 is a wasteful number, since it uses less digits than its factorization.

20123112321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28110 (or 28107 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 20123112321 its reverse (12321132102), we get a palindrome (32444244423).

The spelling of 20123112321 in words is "twenty billion, one hundred twenty-three million, one hundred twelve thousand, three hundred twenty-one".